body{
    width: 100%;
    height: 100%;
    background-color: #f4f4f4;
    color: #3c3c3c;
    overflow-x: hidden;
}
*{
    margin: 0;
    list-style-type: none;
    text-decoration: none;
}
.user-avatar {
    position: fixed;
    top: 60px; /* 距离页面顶部的距离 */
    right: 100px; /* 距离页面右侧的距离 */
    /*display: inline-block;*/
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: #ccc;
    z-index: 999;
    /*color: #5ca4d4; !* 将字体颜色设置为浅蓝色 *!*/
    /*text-align: center;*/
    /*line-height: 30px;*/
    /*font-size: 20px;*/
}
.dropdown-menu{
    width: 70px;
    height: 160px;
    color: #5ca4d4;
    line-height: 25px;
    font-size: 20px;
    text-align: center;
    display: inline-block;
}
.top{
    width: 100%;
    height: 50px;
    background-color: rgba(115,178,201,0.36);
}
.top-c{
    float: left;
    line-height: 50px;
    margin-left: 50px;
}
.top-c-c{
    float: left;
    line-height: 50px;
}
.top-login {
    float: left;
    line-height: 50px;
    text-decoration: none;
}
.top-sign{
    float: left;
    line-height: 50px;
    text-decoration: none;
}
.user-avatar li{
    display: inline-block;
    text-align: center;
    height: 50px;
    width: 100px;
}
.top-nav {
    float: right;
    line-height: 15px;
    margin-right: 50px;
    text-decoration: none;
    display: inline-block;
}
.second{
    width: 100%;
    height: 150px;
}
.second-img{
    float: left;
    margin-left: 25%;
    margin-top: 40px;
    width: 100px;
    height: 100px;
    object-fit: cover;
}
.second-search{
    float: left;
    width: 600px;
    height: 150px;
}
.keyword {
    float: left;
    margin-top: 60px;
    height: 50px;
    width: 400px;
    line-height: 150px;
    margin-left: 50px;
    border-radius: 5px;
}
.btn{
    float: left;
    margin-top: 60px;
    height: 50px;
    width: 80px;
    line-height: 40px;
    margin-left: 20px;
    background-color: rgba(248,171,65,0.36);
    border-radius: 10px;
}
